Probably is black if it happens with hard acceleration .
The main cause for this issue is the MAF sensor from the airfilter box to the turbo.
A good scann tool will confirm the running of the MAF .
A Blocked air filter
or blockage in the air intake before the filter ..
Basically the mix ratio of air to fuel is not correct you are getting too much fuel or too less air .
To much fuel comes normally from the injectors being warn out and weak .
Have the injectors pressure tested if the MAF and airways are clear and clean.
Timing incorrect , cam / crank sensor failure .check for malfunction codes for any possibility with management issues .
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